c# print 2d barcode Lesson 3: Designing Failover and Failback Strategies in C#

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Lesson 3: Designing Failover and Failback Strategies
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7. Back up the last transaction log on the standby. 8. Restore the last transaction log to the primary by using the WITH RECOVERY option. 9. Reconfigure applications to connect to the primary. 10. Remove the log shipping configuration from the standby. 11. Re-create the log shipping configuration on the primary, and reinitialize the standby. 12. Enable the logins on the standby. An automated alternative to the first four steps in this process is to set up log shipping from the standby back to the primary. This procedure reinitializes the primary and applies a continuous chain of transaction logs until you are prepared to take a brief outage on the application.
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Whenever possible, you should ensure that performance or fault tolerance does not degrade if an application needs to fail over to the secondary database. This eliminates any technical reason for needing to fail back to the original primary. If you do not need to fail back to the original primary, you can reverse the direction of log shipping after the failed server is back online. By not having to fail back, you eliminate an additional outage on the application.
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1. Which restore option is used to bring a database online 2. Which two situations require you to take an additional outage and fail back to the original primary after it is repaired and back online
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1. The WITH RECOVERY option brings a database online, making it accessi ble to connections. 2. The only reasons why you need to fail back to the original primary are the following:
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Business dictates failing back. The application performs in a degraded state when running against the secondary.
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10
Log Shipping
Practice: Log Shipping Failover
In this exercise, you fail over to the secondary that you previously configured. 1. Open SQL Server Configuration Manager, and stop the SQL Server service on INSTP to simulate a failure of the primary. 2. Connect to INSTS in the Object Explorer of SSMS. 3. Open the SQL Server error log, and verify the last backup that was restored to the AdventureWorks database. 4. Open a new query window, and change the database context to master. 5. If any transaction log backups have not been applied to the AdventureWorks data base, restore all additional backups that are necessary to roll the database as far forward as possible. 6. After restoring all possible backups, execute the following command:
RESTORE DATABASE AdventureWorks WITH RECOVERY;
7. Verify that the AdventureWorks database is online and accessible. 8. Disable the Copy and Restore jobs from the log shipping configuration. 9. Switch to SQL Server Configuration Manager, and restart INSTP. 10. After INSTP is restarted, connect Object Explorer to the instance within SSMS. 11. Right-click the AdventureWorks database, and choose Properties. 12. Select the Transaction Log Shipping page, clear the Enable This As A Primary Database In A Log Shipping Configuration check box, click Yes to confirm the action, and click OK. 13. Reconfigure log shipping in the opposite direction: INSTS to INSTP.
Lesson Summary
Detecting a failure and failing over is a manual process for log shipping. After the secondary database is recovered, applications can be reconnected and will resume operations. The preferred method for reestablishing redundancy after the primary is fixed is to demote the primary to a secondary and reverse the direction of log shipping. If you are required to fail back to the original primary, an additional outage of the application is required.
Lesson 3: Designing Failover and Failback Strategies
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 3, Designing Failover and Failback Strategies. The questions are also available on the companion CD if you prefer to review them in electronic form.
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